Question

Streptomycin is produced by
A. Streptomyces griseus
B. Streptomyces venezuelae
C. Streptomyces fradiae
D. All of the above

Answer 1

Hint: Streptomycin is the antibiotic first identified. Streptomyces griseus is well known for the production of many antibiotics. Streptomycin is used to kill the infection. Streptomycin strains are found in Streptomyces griesus. Chloramphenicol is produced from Streptomyces venezuelae.

Complete answer:
In 1916, Waksman and Curtis isolated the streptomycin producing organisms which. It was found that Streptomyces griseus produces the streptomycin. It is used as an antibiotic. Professor Selmon Waksman with the graduate student Albert Schatz discovers the streptomycin in 1944. It was found that it was the first antibiotic that was not toxic to animals. It is commonly found in soil. Few strains are also found in soil. It is a gram-positive bacterium. Almost two-thirds of the clinically useful antibiotics can be produced by this bacterium. It can treat a number of infections some of them are: tuberculosis, Mycobacterium avium complex, endocarditis, brucellosis, rat-bite fever, and many more.
Streptomyces venezuelae is a species of gram-positive bacteria. Chloramphenicol, the first antibiotic, was synthetically manufactured by S. venezuelae.
Streptomyces fradiae is a species of Actinobacteria. The strains of streptomyces fradiae are used to produce antibiotics such as neomycin, tylosin, and fosfomycin.
From the above information, we know that streptomycin is produced by Streptomyces griseus.

Hence, the correct answer is option (A).

Note: Streptomyces griseus can also be used for the production of secondary metabolites. These are efficient producers of 32 different structural types of bioactive compounds. It has high GC content in its genome. They grow best in alkaline pH values. It produces grey and yellow spore masses when produced in colonies. It is used to study ecology specific evolution. Ecovars are produced due to variation in genes.